protected async System.Threading.Tasks.Task SelectAll()
{
if (Disabled)
{
return;
}
if (selectedItems.Count != View.Cast <object>().Count())
{
selectedItems.Clear();
selectedItems = View.Cast <object>().ToList();
}
else
{
selectedItems.Clear();
}
if (!string.IsNullOrEmpty(ValueProperty))
{
System.Reflection.PropertyInfo pi = PropertyAccess.GetElementType(Data.GetType()).GetProperty(ValueProperty);
Value = selectedItems.Select(i => PropertyAccess.GetItemOrValueFromProperty(i, ValueProperty)).AsQueryable().Cast(pi.PropertyType);
}
else
{
var type = typeof(T).IsGenericType ? typeof(T).GetGenericArguments()[0] : typeof(T);
Value = selectedItems.AsQueryable().Cast(type);
}
await ValueChanged.InvokeAsync((T)Value);
if (FieldIdentifier.FieldName != null)
{
EditContext?.NotifyFieldChanged(FieldIdentifier);
}
await Change.InvokeAsync(Value);
StateHasChanged();
}
protected async System.Threading.Tasks.Task SelectItem(object item, bool raiseChange = true)
{
if (!Multiple)
{
if (object.Equals(item, selectedItem))
{
return;
}
selectedItem = item;
if (!string.IsNullOrEmpty(ValueProperty))
{
Value = PropertyAccess.GetItemOrValueFromProperty(item, ValueProperty);
}
else
{
Value = item;
}
SetSelectedIndexFromSelectedItem();
SelectedItemChanged?.Invoke(selectedItem);
}
else
{
if (selectedItems.IndexOf(item) == -1)
{
selectedItems.Add(item);
}
else
{
selectedItems.Remove(item);
}
if (!string.IsNullOrEmpty(ValueProperty))
{
System.Reflection.PropertyInfo pi = PropertyAccess.GetElementType(Data.GetType()).GetProperty(ValueProperty);
Value = selectedItems.Select(i => PropertyAccess.GetItemOrValueFromProperty(i, ValueProperty)).AsQueryable().Cast(pi.PropertyType);
}
else
{
var firstElement = Data.Cast <object>().FirstOrDefault();
var elementType = firstElement != null?firstElement.GetType() : null;
if (elementType != null)
{
Value = selectedItems.AsQueryable().Cast(elementType);
}
else
{
Value = selectedItems;
}
}
}
if (raiseChange)
{
await ValueChanged.InvokeAsync(object.Equals(Value, null)?default(T) : (T)Value);
if (FieldIdentifier.FieldName != null)
{
EditContext?.NotifyFieldChanged(FieldIdentifier);
}
await Change.InvokeAsync(Value);
}
StateHasChanged();
}
